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In an Otto cycle, the heat addition and heat rejection take place at
- a)constant volume and at constant pressure respectively
- b)constant volume and at constant volume respectively
- c)constant pressure and at constant volume respectively
- d)constant pressure and at constant pressure respectively
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
In an Otto cycle, the heat addition and heat rejection take place ata)...
Otto cycle: It is the standard air cycle used in the spark ignition (SI) engines or petrol engines.
Different processes of the Otto cycle are as follows:
Process 1-2: Isentropic compression
Process 2-3: Constant volume heat addition
Process 3-4: Isentropic expansion
Process 4-1: Constant volume heat rejection.
Different processes of the Otto cycle are as follows:
Process 1-2: Isentropic compression
Process 2-3: Constant volume heat addition
Process 3-4: Isentropic expansion
Process 4-1: Constant volume heat rejection.
Most Upvoted Answer
In an Otto cycle, the heat addition and heat rejection take place ata)...
Otto cycle is a theoretical thermodynamic cycle that is used in spark-ignition internal combustion engines. The cycle consists of four processes: intake, compression, combustion, and exhaust. In this cycle, the heat addition and heat rejection occur at constant volume.
Explanation:
Heat addition: In an Otto cycle, the heat addition takes place during the combustion process. The fuel-air mixture is ignited by a spark plug, which causes it to burn rapidly and release heat. This heat is added to the system at a constant volume, as the volume of the combustion chamber remains constant during this process.
Heat rejection: After the combustion process, the exhaust gases are expelled from the combustion chamber during the exhaust process. This results in a decrease in temperature and pressure. The heat is rejected from the system at a constant volume, as the volume of the exhaust chamber remains constant during this process.
Constant volume: The heat addition and heat rejection take place at constant volume because the volume of the combustion chamber and exhaust chamber remains constant during these processes. This is because the piston is at the top dead center during the combustion process and at the bottom dead center during the exhaust process, which fixes the volume of the combustion chamber and exhaust chamber.
Constant pressure: The heat addition and heat rejection do not occur at constant pressure in an Otto cycle. This is because the pressure in the combustion chamber increases during the combustion process and decreases during the exhaust process. Therefore, the correct option is (B) constant volume and constant volume for heat addition and heat rejection, respectively.
In conclusion, the heat addition and heat rejection in an Otto cycle occur at constant volume, with the volume of the combustion chamber and exhaust chamber remaining constant during these processes.
Explanation:
Heat addition: In an Otto cycle, the heat addition takes place during the combustion process. The fuel-air mixture is ignited by a spark plug, which causes it to burn rapidly and release heat. This heat is added to the system at a constant volume, as the volume of the combustion chamber remains constant during this process.
Heat rejection: After the combustion process, the exhaust gases are expelled from the combustion chamber during the exhaust process. This results in a decrease in temperature and pressure. The heat is rejected from the system at a constant volume, as the volume of the exhaust chamber remains constant during this process.
Constant volume: The heat addition and heat rejection take place at constant volume because the volume of the combustion chamber and exhaust chamber remains constant during these processes. This is because the piston is at the top dead center during the combustion process and at the bottom dead center during the exhaust process, which fixes the volume of the combustion chamber and exhaust chamber.
Constant pressure: The heat addition and heat rejection do not occur at constant pressure in an Otto cycle. This is because the pressure in the combustion chamber increases during the combustion process and decreases during the exhaust process. Therefore, the correct option is (B) constant volume and constant volume for heat addition and heat rejection, respectively.
In conclusion, the heat addition and heat rejection in an Otto cycle occur at constant volume, with the volume of the combustion chamber and exhaust chamber remaining constant during these processes.
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In an Otto cycle, the heat addition and heat rejection take place ata)constant volume and at constant pressure respectivelyb)constant volume and at constant volume respectivelyc)constant pressure and at constant volume respectivelyd)constant pressure and at constant pressure respectivelyCorrect answer is option 'B'. Can you explain this answer?
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